<html>
  <head>
    <meta content="text/html;charset=utf-8" http-equiv="Content-Type"/>
  </head>
  <body>
    <input id="play" type="button" value="⏯"/>
    (headphone users, please make sure your volume is not too loud!)

    <div>
        Primary frequency: <input type="range" min="30" max="80" value="50" style="width: 400px" id="primary_input"/>
    </div>

    <div>
        Modulation frequency: <input type="range" min="0" max="3" value="0" step="0.05"  style="width: 400px" id="fm_freq"/>
    </div>

    <div>
        Modulation amount: <input type="range" min="0" max="3" value="0" step="0.05"  style="width: 400px" id="fm_amount"/>
    </div>

  </body>
</html>
